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glibc  2.9
qefgcvt.c
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00001 /* Compatibility functions for floating point formatting, long double version.
00002    Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <float.h>
00021 
00022 #define FLOAT_TYPE long double
00023 #define FUNC_PREFIX q
00024 #define FLOAT_FMT_FLAG "L"
00025 /* Actually we have to write (LDBL_DIG + log10 (LDBL_MAX_10_EXP)) but
00026    we don't have log10 available in the preprocessor.  Since we cannot
00027    assume anything on the used `long double' format be generous.  */
00028 #define MAXDIG (NDIGIT_MAX + 12)
00029 #define FCVT_MAXDIG (LDBL_MAX_10_EXP + MAXDIG)
00030 #if LDBL_MANT_DIG == 64
00031 # define NDIGIT_MAX 21
00032 #elif LDBL_MANT_DIG == 53
00033 # define NDIGIT_MAX 17
00034 #elif LDBL_MANT_DIG == 113
00035 # define NDIGIT_MAX 36
00036 #elif LDBL_MANT_DIG == 106
00037 # define NDIGIT_MAX 34
00038 #elif LDBL_MANT_DIG == 56
00039 # define NDIGIT_MAX 18
00040 #else
00041 /* See IEEE 854 5.6, table 2 for this formula.  Unfortunately we need a
00042    compile time constant here, so we cannot use it.  */
00043 # error "NDIGIT_MAX must be precomputed"
00044 # define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * LDBL_MANT_DIG + 1.0)))
00045 #endif
00046 
00047 #include "efgcvt.c"